AOf course it isn't completely faithful but it is close to the myth. Here is what doesn't appear in the myth:*Hercules is actually the Roman name for the hero. His Greek name was Heracles*the Argonauts encounter the sirens and a bronze giant called Talos after they have left Colchis*Jason actually had to yoke two bulls and neither were mechanical. Also he didn't fight the warriors from the dragon's teeth, he threw a stone into them and they attacked each other.*Atalanta never had feelings for Jason. However an Argonaut called Meleager had feelings for her although they were never reciprocated.*Pelias also had three other daughters who don't seem to appear.*Hercules was a son of Zeus, not Hera*Acastus was not Jason's brother, merely his cousin instead. Also he did not betray the Argonauts, he took over the throne when Pelias died (see below).*the entire last part of the feature is untrue. Jason did not kill Pelias, Medea tricked his three daughters to kill him and she and Jason were driven into exile. They did not live happily ever after.